<!DOCTYPE HTML>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=449781
-->
<head>
  <title>Test for Bug 449781</title>
  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
  <script type="text/javascript" src="/tests/SimpleTest/WindowSnapshot.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
</head>
<body>
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=449781">Mozilla Bug 449781</a>
<p id="display">Canary</p>
<iframe src="about:blank" id="ourFrame" style="visibility: hidden">
</iframe>
</div>
<pre id="test">
<script class="testbody" type="text/javascript">
var s1, s2, s3, s4;

/** Test for Bug 449781 **/
SimpleTest.waitForExplicitFinish();
addLoadEvent(function() {
  s1 = snapshotWindow(window);

  $("ourFrame").style.display = "none";
  is($("ourFrame").offsetWidth, 0, "Unexpected width after hiding");
  $("ourFrame").style.display = "";
  is($("ourFrame").clientWidth, 300, "Unexpected width after showing");

  s2 = snapshotWindow(window);

  var equal, str1, str2;
  [equal, str1, str2] = compareSnapshots(s1, s2, true);
  ok(equal, "Show/hide should have no effect",
     "got " + str1 + " but expected " + str2);

  var viewer =
    SpecialPowers.wrap($("ourFrame")).contentWindow
                 .QueryInterface(SpecialPowers.Ci.nsIInterfaceRequestor)
                 .getInterface(SpecialPowers.Ci.nsIWebNavigation)
                 .QueryInterface(SpecialPowers.Ci.nsIDocShell)
                 .contentViewer;
  viewer.fullZoom = 2;
  
  s3 = snapshotWindow(window);

  [equal, str1, str2] = compareSnapshots(s1, s3, true);
  ok(equal, "Zoom should have no effect",
     "got " + str1 + " but expected " + str2);

  $("display").style.display = "none";

  s4 = snapshotWindow(window);
  [equal, str1, str2] = compareSnapshots(s3, s4, true);
  ok(!equal, "Should be able to see the canary");

  SimpleTest.finish();
});



</script>
</pre>
</body>
</html>

